Kerbal Space Program – How to Install Mods for Kerbal Space Program 1.1

With very few exceptions, KSP mods are either parts only (and thus consist only of configuration files) or include plugins written in C# (which work on both Linux and Windows). MechJeb and Protractor specifically I can confidently say work on Linux because I'm using both right now.

All mods - parts or plugins - should be installed to the GameData directory. For example, if KSP were installed in ~/Games/KSP, with MechJeb installed you should have a directory structure that looks something like this:

~/Games/KSP/
  ...other KSP directories...
  GameData/
    Squad/
      ...base game files...
    MechJeb2/
      Parts/
        ...MJ part configurations...
      Plugins/
        ...MJ plugin DLL and PluginData files...

Bear in mind that with MechJeb you need to install a MechJeb part on your rocket to see any UI changes. Furthermore, if you're playing in career mode, you'll need to unlock it in the tech tree before it appears.

I've done this myself. When I was wanting to play with FAR, but have a save without it, I just copied the Kerbal Space Program directory from the SteamApps folder to another location on my hard drive, and it runs just fine.

I will also note that this was done with .23, so I can't imagine why it wouldn't work currently.